Is it possible for a father with type o blood to produce a child with type AB negative?

Answer 1

If you exclude mutations, it's impossible. Father produces gametes o, so one of the child's allele would definitely be o, the other can be A, B or o. That means the child can be oo, Ao, Bo, which phenotipically means A, B, o.

Answer 2

Each parent has two aleles for blood type, plus two alleles for RH factor. Each parent provides one Allele for blood type, and one allele for RH factor.

The possible alleles are A, B, and O. A and B are dominant, and O is recessive. With RH factor the alleles are + and -, with + being dominant.

A father with type O blood could be RH+ with only one + allele, or RH-, with two -alleles. Likewise for the mother, so RH- is not tough to get.

However, the AB part is not possible.

A father with type O blood has two type O alleles, and gives one of these to the children. If the mother is type O, the child will be type O. If she is type A, the child will probably be type A, but might possibly be type O if one of the mother's parents were type O. For type be, the posible blood types are type B, or type O. If the mother is type AB, the child will be either type A, or type B.

There are two ways for a child to come out type AB: The normal way is for one parent to contribute a type A allele, and the other parent contributes a type B allele.

The other way is if the mother is type AB, and the genetic transfer is goofed so she contributes both alleles. Since the two alleles are on opposite pairs of chromosomes, this would probably lead to significant birth defects as well, because the child would have an extra chromosome.
Downs syndrome is one example of birth defects that are caused by an extra chromosome.

Answer 3

I don't think it is possible. There isn't an AB allele, there's an AB genotype and phenotype. For someone to be AB, he/she has to have the A allele on one chromosome and the B allele on the other, so If the mother was AB and the father was O, the child would be either A or B. (AO or BO).

Answer 4

NO! Even if the mother had AB blood, the child would have A or B not AB.

Answer 5

["not" even if mother is AB]
O is the recessive blood type.


Everyone is correct (no possible way, child will be A or B not AB). I shouldn't answer questions when I have a cold.

Answer 6

Only with a rare spontaneous mutation or if the father, himself, expresses chimerism.

Or, as mentioned above, if there is polyploidy from the mother.

It is possible, but very unlikely.

Answer 7

Sounds like someone needs to get a DNA test to determine whether or not the baby mama has been on the prowl.